21016130 has 8 divisors (see below), whose sum is σ = 37829052. Its totient is φ = 8406448.

The previous prime is 21016129. The next prime is 21016139. The reversal of 21016130 is 3161012.

It can be written as a sum of positive squares in 2 ways, for example, as 18653761 + 2362369 = 4319^2 + 1537^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21016139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050797 + ... + 1050816.

Almost surely, 2^21016130 is an apocalyptic number.

21016130 is a deficient number, since it is larger than the sum of its proper divisors (16812922).

21016130 is a wasteful number, since it uses less digits than its factorization.

21016130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101620.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 21016130 is about 4584.3352844224. The cubic root of 21016130 is about 275.9630367779.

Adding to 21016130 its reverse (3161012), we get a palindrome (24177142).

The spelling of 21016130 in words is "twenty-one million, sixteen thousand, one hundred thirty".